dt175mx done blowed up

Day started well, planned to put on tyre and fit temp gauge. you can see the off road tyre was getting quite chewed.

Popped out for milk later and well i might have spanked it a bit hard, for those that don’t know 250C is melting aluminium time, if it reached 238C at the spark plug it got well hotter than that. and i wasn’t quick enough on the clutch.

I have my suspicions about that exhaust port, it’s a couple of mm lower on one side, and the high corner is the one that seized, to much exhaust T.A on a air cooled bike makes it run hot and lose power, have to find what the stock port should be!


So eh, time to make one of those spare bikes go? James helped!

More tuning to come of the DT, i had too much fun and need a two-stoke permanently in my life, it a new house rule.

DT175MX new pipe

New pipe fitted, from yambits, quite inexpensive, really gave it a proper powerband up top super entertaining to ride now. and not because the brakes are suddenly not up to the job

midrange is a little bit weak, or it was me just tip toeing about since the noise is really loud now and i don’t want to piss my neighbours off.


also note the stud on the right was buggered at some point, 10mm stud upgrade! for only one side!


Shots down the barrel, this is as low as i can put the piston, transfers are still shrouded, so lifting the barrel will work great.

but only after i find a better combustion chamber, blaster ysf200 head on the right is 6x97mm and the DT on the left is 6x93mm, neither head is a performance head, the offset squish was terrible idea and the tiny chamber and buried plug of the blaster won’t work too well at higher output.

it175 d/e/f will fit but are over 40 years old and a little expensive, i think the DT175 84-96 might fit, but i can’t find good pics.


DT175 tuning work

So time for some DT love

Kick start doesn’t quite fit, a s/h one is quite expensive and a new pattern one broke immediatly.

Stock filter is long gone, this works well enough, no change of rain water getting in i think.

had issues with the pilot jet acting lean, it was a little bit of rust, blew through no worries

Previous bodge job, it works so i’ll leave it.

Further work needs a stand, batterys are heavier than the bike.

Blaster 200 head, it was cheap, but the studs don’t line up 🙁 really need a better combustion chamber/centralised bowl and squish band for any performance gain.

Offset inlet, don’t like that either, can change for a rd350 one (aircooled i think) but i’m worried the PWK will then hit the case, airbox will need a lot of work to fit a filter then.

Shiny Silencer

Jetting notes


Needs a video soon.

the yearly update…

Just under a year since the last update, gotta find an easier way to post here,

anyway here’s a request, yes thats the rxs100/ysr50 back there, no it’s not coming out.

during lockdown i remember to take short spins every night for my mental health. New fav is this dt175mx, lots to do, probably never do it tho!

shed clear out

After rearrange, started work again on the rg.

Expensive, but now the shed (near 5 years since i bought it) has power, got a armoured cable, ethernet, separate breaker switch and this lovely light switch installed!

Really got to get back into this again, but projects are at an all time slow with life and other boring stuff happening.


Back to the darkside.

Some Rg125 bits first, the stock four pot is a great caliper, but pretty heavy, measure against another four pot i had lying around.

So lets upgrade to the two pot sliding caliper! ok that make little sense, but lightness comes first when you have can’t have more power.

This drain nozzle on the bottom of the airbox is the only part of the bike that hits the s1000rr shock. specifically the rubber tube thats attached to this.

Since the depth is fine i just heated it with as heat gun and slowly squished it shut.

Next i started to take a look at mounting the top fairing, stock head lamp cage hit the brake lever, looking into ways of remaking the whole lot out of aluminium.

So enough of the crap piles, my two new bikes are a freshly restored DT175MX..

..and yet another cbr6! gah actually this is only a loaner, couldn’t stand the gb400 any more so although i know i should not go back, i went back, the darkside has tight suspension and shiny bodywork.

carbs needed a little clean from sitting so long, i had the seat/side panels/tank/airbox and carbs off quicker then my dad re installing the dt175 rear wheel, he didn’t know it was a race but a win is a win.


So very distracting.

tiny bit of noise off of the camchain tensioner, i think my old cbr6 had a different shape, may change over.

Got those blind holes tapped with the help of a snapped tap, very happy to see it on, less happy when i realised i hadn’t taken note of the timing marks..

Bench cleaned for the new head, gotta copy the porting over from the race head since that was so wildly successful.

Complete head cost €16, will those valves stand the abuse?